U.S. patent application number 16/577501 was filed with the patent office on 2020-01-09 for female syringe and syringe kit.
This patent application is currently assigned to TERUMO KABUSHIKI KAISHA. The applicant listed for this patent is TERUMO KABUSHIKI KAISHA. Invention is credited to Hitoshi OKIHARA.
Application Number | 20200009326 16/577501 |
Document ID | / |
Family ID | 63584386 |
Filed Date | 2020-01-09 |
![](/patent/app/20200009326/US20200009326A1-20200109-D00000.png)
![](/patent/app/20200009326/US20200009326A1-20200109-D00001.png)
![](/patent/app/20200009326/US20200009326A1-20200109-D00002.png)
![](/patent/app/20200009326/US20200009326A1-20200109-D00003.png)
![](/patent/app/20200009326/US20200009326A1-20200109-D00004.png)
![](/patent/app/20200009326/US20200009326A1-20200109-D00005.png)
![](/patent/app/20200009326/US20200009326A1-20200109-D00006.png)
![](/patent/app/20200009326/US20200009326A1-20200109-D00007.png)
![](/patent/app/20200009326/US20200009326A1-20200109-D00008.png)
![](/patent/app/20200009326/US20200009326A1-20200109-D00009.png)
United States Patent
Application |
20200009326 |
Kind Code |
A1 |
OKIHARA; Hitoshi |
January 9, 2020 |
FEMALE SYRINGE AND SYRINGE KIT
Abstract
A female syringe of a syringe kit includes a female syringe
barrel including a cylindrical portion into which a nozzle of a
male syringe is insertable, a hollow cylindrical packing arranged
in the cylindrical portion, and a cap detachably attached to the
cylindrical portion. When the cap is detached from the cylindrical
portion, the packing remains in the cylindrical portion, a distal
end opening is opened, and the nozzle of the male syringe is fitted
in a liquid-tight manner to an inner side of the packing.
Inventors: |
OKIHARA; Hitoshi; (Shizuoka,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
TERUMO KABUSHIKI KAISHA |
Tokyo |
|
JP |
|
|
Assignee: |
TERUMO KABUSHIKI KAISHA
Tokyo
JP
|
Family ID: |
63584386 |
Appl. No.: |
16/577501 |
Filed: |
September 20, 2019 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
PCT/JP2018/010267 |
Mar 15, 2018 |
|
|
|
16577501 |
|
|
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A61M 5/3129 20130101;
A61M 5/19 20130101; A61M 2005/3131 20130101; A61M 2005/31598
20130101; A61M 5/31596 20130101; A61M 5/1782 20130101 |
International
Class: |
A61M 5/315 20060101
A61M005/315; A61M 5/178 20060101 A61M005/178; A61M 5/19 20060101
A61M005/19 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 22, 2017 |
JP |
2017-055227 |
Claims
1. A female syringe comprising: a female syringe barrel comprising:
a hollow barrel body having an inner peripheral surface on which a
gasket is slidable, a cylindrical portion extended in a distal end
direction from a distal end of the barrel body, into which a nozzle
of a male syringe is insertable, and a projection with which a
screw of a lock adapter of the male syringe is screwable; a hollow
cylindrical packing made of an elastic material and arranged in the
cylindrical portion; and a cap detachably attached to the
cylindrical portion and configured to close, in a liquid-tight
manner, an opening of the packing; wherein the female syringe is
configured such that, when the cap is detached from the cylindrical
portion, the packing remains in the cylindrical portion, the
opening is opened, and the nozzle of the male syringe is fittable
in a liquid-tight manner to an inner side of the packing; and at
least in a state in which the cap is attached to the cylindrical
portion and in a state in which the nozzle of the male syringe is
fitted in a liquid-tight manner to the inner side of the packing,
an outer peripheral surface of the packing is in close contact with
an inner peripheral surface of the cylindrical portion so as to
make a full circle of a liquid tight sealing portion in a
circumferential direction of the cylindrical portion.
2. The female syringe according to claim 1, wherein: the cap
comprises: a base, and a convex fitting portion projecting in a
proximal end direction from the base; and the packing is held
between the inner peripheral surface of the cylindrical portion and
an outer peripheral surface of the convex fitting portion in a
compressed state over an entire circumference of the packing.
3. The female syringe according to claim 2, wherein: an inner
peripheral surface of the packing comprises: a first fitting
surface to which the convex fitting portion is fitted, and a second
fitting surface to which the nozzle of the male syringe is
fittable, wherein the second fitting surface is formed on a
proximal end side of the first fitting surface, and wherein an
inner diameter of the second fitting surface is smaller than an
inner diameter of the first fitting surface.
4. The female syringe according to claim 1, wherein: a radially
projecting engaging convex portion is provided on one of the inner
peripheral surface of the cylindrical portion and the outer
peripheral surface of the packing; an engaging concave portion
having a depth in a radial direction is provided on the other of
the inner peripheral surface of the cylindrical portion and the
outer peripheral surface of the packing; and movement of the
packing in an axial direction with respect to the cylindrical
portion is restricted by engagement between the engaging convex
portion and the engaging concave portion.
5. The female syringe according to claim 4, wherein: the engaging
concave portion is provided on the outer peripheral surface of the
packing.
6. The female syringe according to claim 1, wherein: a distal end
portion of the packing comprises a ring-shaped swelling portion
projecting radially outward and is locked by a distal end surface
of the cylindrical portion.
7. A syringe kit comprising: a male syringe comprising a male
syringe barrel comprising: a nozzle formed as a male lure, and a
lock adapter comprising a screw; and a female syringe including a
female syringe barrel for comprising: a cylindrical portion into
which the nozzle is insertable, and a projection with which the
screw of the lock adapter is screwable; wherein the female syringe
comprises: a hollow cylindrical packing made of an elastic material
and fitted in the cylindrical portion, and a cap detachably
attached to the cylindrical portion to close, in a liquid-tight
manner, an opening of the packing; and wherein the syringe kit is
configured such that, when the cap is detached from the cylindrical
portion, the packing remains in the cylindrical portion, the
opening is opened, and the nozzle of the male syringe is fittable
in a liquid-tight manner to an inner side of the packing.
8. The syringe kit according to claim 7, wherein: the cylindrical
portion comprises: a first cylindrical portion provided with the
projection and having an outer diameter smaller than an inner
diameter of the screw, and a second cylindrical portion formed
adjacent to a proximal end side of the first cylindrical portion
and having an outer diameter larger than the outer diameter of the
first cylindrical portion; and the screw is on a distal end portion
of the lock adapter and fits to the second cylindrical portion in a
state in which the fitting of the nozzle to the cylindrical portion
via the packing is completed.
9. The syringe kit according to claim 7, wherein: in a state in
which the fitting of the nozzle to the cylindrical portion via the
packing is completed, the packing is held between the cylindrical
portion and the nozzle in a compressed state over an entire
circumference of the packing.
10. The syringe kit according to claim 7, wherein: the cylindrical
portion comprises an abutment portion that restricts a fitting
depth of the nozzle into the cylindrical portion by abutment of a
distal end of the lock adapter when the nozzle is fitted to the
cylindrical portion via the packing.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This is a bypass continuation of PCT Application No.
PCT/JP2018/010267, filed on Mar. 15, 2018, which claims priority to
Japanese Application No. 2017-055227, filed on Mar. 22, 2017. The
contents of these applications are hereby incorporated by reference
in their entireties.
BACKGROUND
[0002] The present disclosure relates to a female syringe and a
syringe kit.
[0003] A syringe kit for mixing two medicines--a first medicine in
a first barrel and a second medicine in a second barrel--is
disclosed, for example, in JP 2013-132349 A. This syringe kit is
provided with a first barrel (barrel of a female syringe) including
a connecting cylindrical portion provided with an inner tapered
surface on an inner periphery and a male screw on an outer
periphery, and a second barrel (barrel of a male syringe) including
a nozzle portion provided with an outer tapered surface on an outer
periphery that may be fitted to the inner tapered surface of the
connecting cylindrical portion and a screw cylindrical portion
having a female screw screwable with the male screw on an inner
periphery. In the syringe kit, in order to mix the medicine in the
first barrel and the medicine in the second barrel, the connection
cylindrical portion of the first barrel and the screw cylindrical
portion of the second barrel are connected by screwing.
SUMMARY
[0004] To inhibit liquid leakage in a connected state, the first
barrel and the second barrel need to be strongly fitted. In the
syringe kit disclosed in JP 2013-132349 A described above, a
screwing portion of the connecting cylindrical portion of the first
barrel and a screwing portion of the screw cylindrical portion of
the second barrel are both screw-shaped, so that excessive screwing
is possible. Therefore, there is a problem that the tapered
surfaces are excessively fitted to each other, and the connection
cylindrical portion (opening) of the first barrel is damaged or
deformed, so that liquid tightness between the nozzle and the
cylindrical portion is deteriorated. In addition, there is a
problem that a distal end portion of either the first barrel or the
second barrel is twisted to be damaged or deformed, and the liquid
tightness between the nozzle and the cylindrical portion is
deteriorated.
[0005] Embodiments of the present invention have been developed in
consideration of such problems, and an object of certain
embodiments is to provide a female syringe and a syringe kit
capable of inhibiting damage and deformation of a barrel of a
female syringe or a barrel of a male syringe due to excessive
torque and inhibiting deterioration in liquid tightness between a
nozzle and a cylindrical portion when screwing the barrel of the
female syringe and the barrel of the male syringe with each
other.
[0006] According to one embodiment, a female syringe includes a
barrel including a hollow barrel body having an inner peripheral
surface on which a gasket is slidable, a cylindrical portion
extended in a distal end direction from a distal end of the barrel
body into which a nozzle of a male syringe is insertable, and a
projection with which a screw of a lock adapter of the male syringe
is screwable; a hollow cylindrical packing made of an elastic
material and arranged in the cylindrical portion to be integrated
with the cylindrical portion; and a cap detachably attached to the
cylindrical portion to close, in a liquid-tight manner, an opening
of the packing. When the cap is detached from the cylindrical
portion, the packing integrated with the cylindrical portion
remains in the cylindrical portion, the opening is opened, and the
nozzle of the male syringe is fittable in a liquid-tight manner to
an inner side of the packing. At least in a state in which the cap
is attached to the cylindrical portion and in a state in which the
nozzle of the male syringe is fitted in a liquid-tight manner to
the inner side of the packing, an outer peripheral surface of the
packing is in close contact with an inner peripheral surface of the
cylindrical portion so as to make a full circle of a liquid tight
sealing portion in a circumferential direction of the cylindrical
portion.
[0007] According to the female syringe having the above-described
configuration, even when the cap is detached from the cylindrical
portion of the barrel, the packing remains in the cylindrical
portion. Then, when the projection and the lock adapter are screwed
together to connect the female syringe and the male syringe, the
nozzle is inserted into the cylindrical portion. As a result, the
cylindrical portion and the nozzle are fitted in a liquid-tight
manner via the packing. For this reason, damage and deformation of
the barrel can be inhibited while securing good liquid tightness at
the time of fitting.
[0008] The cap may include a base and a convex fitting portion
projecting in a proximal end direction from the base, and the
packing may be held over an entire circumference in a compressed
state between the inner peripheral surface of the cylindrical
portion and an outer peripheral surface of the convex fitting
portion.
[0009] This configuration may ensure better liquid tightness.
[0010] The inner peripheral surface of the packing may include a
first fitting surface to which the convex fitting portion is fitted
and a second fitting surface having an inner diameter smaller than
an inner diameter of the first fitting surface to which the nozzle
of the male syringe is fittable formed on a proximal end side than
the first fitting surface.
[0011] With this configuration, the inner diameter is set
individually for the first fitting surface and the second fitting
surface, so that the liquid tightness may be better secured in the
cap attached (unopened) state and the male/female syringe fitted
state.
[0012] A radially projecting engaging convex portion may be
provided on one of the inner peripheral surface of the cylindrical
portion and the outer peripheral surface of the packing, an
engaging concave portion having a depth in a radial direction may
be provided on the other of the inner peripheral surface of the
cylindrical portion and the outer peripheral surface of the
packing, and movement of the packing in an axial direction with
respect to the cylindrical portion may be restricted by engagement
between the engaging convex portion and the engaging concave
portion.
[0013] As a result, removal of the packing from the cylindrical
portion when the cap is opened may be realized by a simple
configuration, and the packing may be surely left inside the
cylindrical portion after the cap is opened.
[0014] The engaging concave portion may be provided on the outer
peripheral surface of the packing.
[0015] By this configuration, the movement in the axial direction
of the packing may be restricted without deteriorating rigidity of
the cylindrical portion.
[0016] A distal end portion of the packing may be provided with the
ring-shaped swelling portion projecting radially outward and is
locked by the distal end surface of the cylindrical portion may be
provided.
[0017] With this configuration, when the nozzle is fitted to the
packing, the movement of the packing toward the barrel body may be
surely inhibited.
[0018] According to another embodiment, a syringe kit includes: a
male syringe including a barrel including a nozzle formed as a male
lure and a lock adapter provided with a screw; and a female syringe
including a barrel including a cylindrical portion into which the
nozzle is insertable, and a projection with which the screw of the
lock adapter is screwable, in which the female syringe is provided
with a hollow cylindrical packing made of an elastic material and
fitted in the cylindrical portion, and a cap detachably attached to
the cylindrical portion to close, in a liquid-tight manner, an
opening of the packing, and when the cap is detached from the
cylindrical portion, the packing remains in the cylindrical
portion, the opening is opened, and the nozzle of the male syringe
is fittable in a liquid-tight manner to an inner side of the
packing.
[0019] By this configuration, damage and deformation of the barrel
of the female syringe can be inhibited while securing good liquid
tightness at the time of fitting.
[0020] In the above-described syringe kit, the cylindrical portion
may include a first cylindrical portion provided with the
projection and has an outer diameter smaller than an inner diameter
of the screw, and a second cylindrical portion formed adjacent to a
proximal end side of the first cylindrical portion and having an
outer diameter larger than the outer diameter of the first
cylindrical portion, and the screw on a distal end portion of the
lock adapter may fit to the second cylindrical portion in a state
in which the fitting of the nozzle to the cylindrical portion via
the packing is completed.
[0021] With this configuration, when the screw on the distal end
portion of the lock adapter is fitted at the time of fitting, a
fitting force stronger than that obtained by only fitting via
packing may be obtained.
[0022] In the above-described syringe kit, in a state in which the
fitting of the nozzle to the cylindrical portion via the packing is
completed, the packing may be held between the cylindrical portion
and the nozzle in a compressed state over an entire
circumference.
[0023] This configuration provides better liquid tightness.
[0024] In the above-described syringe kit, the cylindrical portion
may be provided with an abutment portion that restricts a fitting
depth of the nozzle into the cylindrical portion by abutment of a
distal end of the lock adapter when the nozzle is fitted to the
cylindrical portion via the packing.
[0025] By this configuration, excessive fitting between the
cylindrical portion and the nozzle may be effectively
inhibited.
[0026] According to certain embodiments of the present invention,
it is possible to inhibit damage and deformation of the barrel of
the female syringe or the barrel of the male syringe due to
excessive torque and inhibiting deterioration in liquid tightness
between the nozzle and the cylindrical portion when screwing the
barrel of the female syringe and the barrel of the male syringe
with each other.
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] FIG. 1 is a perspective view of a syringe kit according to
an embodiment of the present invention.
[0028] FIG. 2 is a cross-sectional view of a barrel of a male
syringe.
[0029] FIG. 3 is a cross-sectional view of a barrel of a female
syringe.
[0030] FIG. 4 is a cross-sectional view of a distal end portion of
a female syringe.
[0031] FIG. 5 is a perspective view of a distal end portion of the
barrel of the female syringe.
[0032] FIG. 6A is a perspective view of a packing, and FIG. 6B is a
cross-sectional view of the packing.
[0033] FIG. 7 is a cross-sectional view of a state in which a cap
is detached from a cylindrical portion of the barrel of the female
syringe.
[0034] FIG. 8 is a cross-sectional view of a state in which the
male syringe and the female syringe are connected.
[0035] FIG. 9 is a perspective view of a state in which the male
syringe and the female syringe are connected.
DETAILED DESCRIPTION
[0036] Embodiments of a female syringe and a syringe kit according
to the present invention are described below with reference to the
accompanying drawings.
[0037] A syringe kit 10 according to this embodiment illustrated in
FIG. 1 is a mixing kit for mixing a filling in one barrel and a
filling in the other barrel. The syringe kit 10 is provided with a
male syringe 12 and a female syringe 14 that may be screwed to be
connected to each other. Both the male syringe 12 and the female
syringe 14 are formed as prefilled syringes filled with contents
such as medicine in advance.
[0038] Note that, in the following description, as for the male
syringe 12, a side connected to the female syringe 14 or a
direction thereof is referred to as a "distal end portion" or a
"distal end direction", and the opposite side or the opposite
direction is referred to as a "proximal end portion" or a "proximal
end direction". Also, as for the female syringe 14, a side
connected to the male syringe 12 or a direction thereof is referred
to as a "distal end portion" or a "distal end direction", and the
opposite side or the opposite direction is referred to as a
"proximal end portion" or a "proximal end direction".
[0039] The male syringe 12 is provided with a barrel 16
(hereinafter abbreviated as a "male syringe barrel 16"), which is a
hollow body, a cap 50 attached to the distal end portion of the
male syringe barrel 16, a gasket 18 slidably inserted into the male
syringe barrel 16, a pusher 20 connected to the gasket 18, and
medicine M filled in a barrel chamber 17 formed of the barrel of
the male syringe 16 and the gasket 18.
[0040] As illustrated in FIG. 2, the male syringe barrel 16
includes a barrel body 22 having a substantially cylindrical shape
on a proximal end of which a proximal end opening 22a is formed, a
nozzle 24 provided on a distal end of the barrel body 22, a lock
adapter 26 provided on an outer side of the nozzle 24, and a flange
29 formed so as to project radially outward from the proximal end
of the barrel body 22. The barrel body 22, the nozzle 24, the lock
adapter 26, and the flange 29 are integrally molded.
[0041] An outer diameter D1 of the barrel body 22 is not especially
limited, but is preferably 6.7 mm or larger. Also, a length L1 in
an axial direction of the barrel body 22 is not especially limited,
but is preferably 35 mm or longer, and is more preferably 47 mm or
longer. By setting the outer diameter D1 and the length L1 in the
axial direction of the barrel body 22 in this manner, it is
possible to easily screw while gripping the barrel body 22 when
connecting the male syringe 12 to the female syringe 14.
[0042] The nozzle 24 extends from a central portion of the distal
end of the barrel body 22 in the distal end direction such that a
diameter thereof decreases with respect to the barrel body 22. The
nozzle 24 includes a passage 24b that penetrates in the axial
direction and is communicated with an inner cavity (barrel chamber
17) of the barrel body 22.
[0043] The nozzle 24 is formed as a male lure including a tapered
outer peripheral surface 24a a cross-sectional outer shape of which
is circular and an outer diameter of which decreases in the distal
end direction. The nozzle 24 may be fitted in a cylindrical portion
38 (female lure) to be described later of the female syringe 14.
The nozzle 24 projects in the distal end direction from a distal
end surface of the lock adapter 26.
[0044] In FIG. 2, the lock adapter 26 is formed into a
substantially hollow cylindrical shape that extends in the distal
end direction from the distal end of the barrel body 22 and
surrounds the nozzle 24 concentrically. A screw 28 is formed on an
inner peripheral surface of the lock adapter 26.
[0045] In an initial state of the male syringe 12 illustrated in
FIG. 1, the cap 50 is attached to the nozzle 24, and a distal end
opening 24c of the nozzle 24 is sealed by the cap 50. The cap 50 is
detached from the nozzle 24 when the male syringe 12 is used (when
the syringe kit 10 is used).
[0046] As illustrated in FIG. 2, the cap 50 includes a hollow cap
main body 52 made of a hard material and a sealing member 54 made
of an elastic material attached to an inner side of the cap main
body 52. A projection 52a which releasably engages with the screw
28 of the lock adapter 26 is formed on an outer peripheral portion
of a proximal end of the cap main body 52.
[0047] The sealing member 54 is fixed to an inner peripheral
portion of the cap main body 52. The sealing member 54 includes a
sealing concave portion 54a opened in the proximal end direction
and the nozzle 24 fits in the sealing concave portion 54a. In a
state before usage in which the cap 50 is attached to the nozzle 24
(unopened state), the sealing member 54 is in close contact with
the nozzle 24 in a liquid tight manner.
[0048] In FIG. 1, the gasket 18 is inserted into the barrel body 22
via the proximal end opening 22a that opens at the proximal end of
the barrel body 22. The proximal end side of the barrel body 22 is
sealed in a liquid tight manner by the gasket 18. The gasket 18 is
made of, for example, an elastic material such as a rubber
material. The gasket 18 is slidably arranged in the barrel body 22
with an outer peripheral portion in liquid tight contact with the
inner peripheral surface of the barrel body 22.
[0049] The gasket 18 is connected to a distal end portion of the
pusher 20. As a user pushes the pusher 20 in the axial direction
(distal end direction or proximal end direction), the gasket 18
slides in the axial direction in the barrel body 22. Note that, the
pusher 20 may also be connected to the gasket 18 when the male
syringe 12 is used.
[0050] As long as the medicine M is dissolved/diluted/mixed by
medical fluid ML (specifically, solution such as physiological
saline) filled in the female syringe 14, this may be of any type
such as powdered medicine, freeze-dried medicine, solid medicine,
and liquid medicine. Such medicine M includes, for example, protein
preparations, peptide preparations, antitumor agents, vitamins
(multivitamins), various amino acids, antithrombotic agents such as
heparin, insulin, antibiotics, analgesics, cardiotonic agents,
intravenous injection anesthetics, medical narcotics,
anti-parkinsonian agents, ulcer treatment agents, corticosteroids,
arrhythmic agents and the like.
[0051] The female syringe 14 is provided with a barrel 30
(hereinafter abbreviated as a "female syringe barrel 30"), which is
a hollow body, a packing 56 (refer to FIG. 3) arranged on an inner
portion of the distal end of the female syringe 14, and a cap 58
attached to the distal end portion of the female syringe 14. The
female syringe 14 is further provided with a gasket 32 slidably
inserted into the female syringe barrel 30, a pusher 34 connected
to the gasket 32, and the medical fluid ML filled in a barrel
chamber 37 formed of the barrel of the female syringe 30 and the
gasket 32.
[0052] As illustrated in FIG. 3, the female syringe barrel 30
includes a barrel body 36 having a substantially cylindrical shape
and having a proximal end opening 36a formed on a proximal end
thereof, a cylindrical portion 38 projecting in the distal end
direction from a distal end of the barrel body 36, and a flange 40
formed so as to project radially outward from the proximal end of
the barrel body 36. The barrel body 36, the cylindrical portion 38,
and the flange 40 are integrally molded. Note that, although the
cylindrical portion 38 is smaller than the barrel body 36 in FIG.
3, the cylindrical portion 38 may be of the same size as that of
the barrel body 36 or may be larger than the barrel body 36.
[0053] An outer diameter D2 of the barrel body 36 is not especially
limited, but is preferably 6.7 mm or larger. Also, a length L2 in
an axial direction of the barrel body 36 is not especially limited,
but is preferably 35 mm or longer, and is more preferably 47 mm or
longer. By setting the outer diameter D2 and the length L2 in the
axial direction of the barrel body 36 in this manner, it is
possible to easily screw while gripping the barrel body 36 when
connecting the female syringe 14 to the male syringe 12.
[0054] The cylindrical portion 38 extends from a central portion of
the distal end of the barrel body 36 in the distal end direction
such that a diameter thereof decreases with respect to the barrel
body 36. The cylindrical portion 38 has a substantially cylindrical
shape penetrating in the axial direction. The nozzle 24 (refer to
FIG. 2) of the male syringe 12 may be inserted into the cylindrical
portion 38.
[0055] As illustrated in FIGS. 4 and 5, on an outer peripheral
portion of a distal end of the cylindrical portion 38, two
projections 42 projecting outward (radially outward) in opposite
directions with respect to an axis a (center line) of the
cylindrical portion 38 are provided. The two projections 42 may be
screwed with the screw 28 (refer to FIG. 2) provided on the lock
adapter 26 of the male syringe barrel 16.
[0056] The cylindrical portion 38 includes a first cylindrical
portion 38A provided with the projections 42 and having an outer
diameter smaller than an inner diameter of the screw 28, and a
second cylindrical portion 38B formed so as to be adjacent to a
proximal end side of the first cylindrical portion 38A and having
an outer diameter larger than the outer diameter of the first
cylindrical portion 38A. The first cylindrical portion 38A forms a
distal end side of the cylindrical portion 38. The second
cylindrical portion 38B forms a proximal end side of the
cylindrical portion 38.
[0057] As illustrated in FIG. 4, an engaging convex portion 39a
projecting radially inward is provided on an inner peripheral
surface of the cylindrical portion 38. The engaging convex portion
39a is formed into an annular shape to make a full circle in a
circumferential direction. The engaging convex portion 39a is
provided on the second cylindrical portion 38B. A projecting height
of the engaging convex portion 39a from the inner peripheral
surface of the cylindrical portion 38 is shorter than a thickness
of the cylindrical portion 38. Note that, the engaging convex
portion 39a may be formed in a range smaller than a full circle in
the circumferential direction, or a plurality of the same may be
formed at intervals in the circumferential direction. The engaging
convex portion 39a may also be provided on the first cylindrical
portion 38A or may be provided across the first cylindrical portion
38A and the second cylindrical portion 38B.
[0058] As illustrated in FIG. 5, on an outer peripheral surface of
the cylindrical portion 38, an abutment portion 38b is provided for
restricting a fitting depth of the nozzle 24 (refer to FIG. 2) into
the cylindrical portion 38. Specifically, the abutment portion 38b
projects radially outward from an outer peripheral surface of the
second cylindrical portion 38B and extends in the circumferential
direction. In FIG. 5, two abutment portions 38b are arranged on
opposite sides with respect to the axis a of the cylindrical
portion 38. In a state in which the cap 58 is attached to the
cylindrical portion 38 (cap unopened state) as illustrated in FIG.
4, the abutment portion 38b is covered with the cap 58 and fitted
to an inner peripheral surface of the cap 58.
[0059] The packing 56 is arranged in the cylindrical portion 38 and
is integrated with the cylindrical portion 38. In FIG. 4, the
packing 56 is fitted in the cylindrical portion 38 and is in close
contact with the inner peripheral surface of the cylindrical
portion 38 in a liquid tight manner over an entire circumference.
The packing 56 is a hollow cylindrical member made of an elastic
material and having an inner cavity 57 penetrating in the axial
direction. The packing 56 is held between the inner peripheral
surface of the cylindrical portion 38 and an outer peripheral
surface of a convex fitting portion 58b to be described later of
the cap 58 in a compressed state over the entire circumference.
Note that the packing 56 may also be integrated with the
cylindrical portion 38 by bonding, welding, two-color molding or
the like.
[0060] At least in a state in which the cap 58 is attached to the
cylindrical portion 38 and in a state in which the nozzle 24 of the
male syringe 12 fits in the inner side of the packing 56 in a
liquid tight manner, the outer peripheral surface of the packing 56
is in close contact with the inner peripheral surface of the
cylindrical portion 38 so as to make a full circle of a liquid
tight sealing portion in the circumferential direction of the
cylindrical portion 38. Note that, in a state in which the cap 58
is detached from the cylindrical portion 38 and in a state in which
the nozzle 24 of the male syringe 12 is not inserted into the
packing 56, the outer peripheral surface of the packing 56 is not
required to be in close contact with the inner peripheral surface
of the cylindrical portion 38.
[0061] The packing 56 is provided with a first peripheral wall
portion 60 including a first fitting surface 60a to which the
convex fitting portion 58b is fitted in the unopened state of the
cap 58 and a second peripheral wall portion 62 including a second
fitting surface 62a formed on the proximal end side than the first
fitting surface 60a. The first fitting surface 60a forms a distal
end side area of the inner peripheral surface of the packing 56. As
illustrated in FIG. 6B, the first fitting surface 60a is formed
into a tapered shape an outer diameter of which decreases in the
proximal end direction. Note that the first fitting surface 60a may
also be formed into a straight shape having a constant outer
diameter in the axial direction.
[0062] The second fitting surface 62a forms a proximal end side
area of the inner peripheral surface of the packing 56. The second
fitting surface 62a has an inner diameter smaller than an inner
diameter of the first fitting surface 60a, and the nozzle 24 (refer
to FIG. 2) of the male syringe 12 may be fitted thereto. A step is
formed between the first fitting surface 60a and the second fitting
surface 62a. The second fitting surface 62a is formed into a
tapered shape (female lure) an outer diameter of which decreases in
the proximal end direction. Note that the second fitting surface
62a may also be formed into a straight shape having a constant
outer diameter in the axial direction.
[0063] As illustrated in FIGS. 6A and 6B, the outer peripheral
surface of the packing 56 is provided with an engaging concave
portion 39b having a depth in the radial direction. The engaging
concave portion 39b is formed into an annular shape that makes a
full circle in the circumferential direction. The engaging concave
portion 39b is provided on an outer peripheral surface of the
second peripheral wall portion 62 (a position surrounding the
second fitting surface 62a). As illustrated in FIG. 4, the engaging
convex portion 39a provided on the cylindrical portion 38 engages
with the engaging concave portion 39b. Movement of the packing 56
in the axial direction with respect to the cylindrical portion 38
is restricted by the engagement of the engaging convex portion 39a
with the engaging concave portion 39b.
[0064] Note that, the engaging concave portion 39b may be formed in
a range smaller than a full circle in the circumferential
direction, or a plurality of the same may be formed at intervals in
the circumferential direction. It is also possible that an engaging
convex portion which projects radially outward is provided on the
outer peripheral surface of the packing 56, an engaging concave
portion having a depth in the radial direction is provided on the
inner peripheral surface of the cylindrical portion 38, and the
engaging convex portion and the engaging concave portion engage
with each other unlike the configuration illustrated in FIG. 4 and
the like.
[0065] A ring-shaped swelling portion 64 projecting radially
outward is provided on a distal end portion of the packing 56 (a
distal end portion of the first peripheral wall portion 60). In a
state in which the cap 58 is attached to the cylindrical portion
38, the ring-shaped swelling portion 64 is held between a distal
end surface 38e of the cylindrical portion 38 and a base 58a of the
cap 58 in the axial direction, and is in close contact with the
distal end surface 38e and the base 58a in a full circle in a
liquid tight manner.
[0066] As an elastic material of the packing 56, there may be, for
example, various rubber materials such as natural rubber, butyl
rubber, isoprene rubber, butadiene rubber, styrene-butadiene
rubber, and silicone rubber, various thermoplastic elastomers such
as a polyurethane type, a polyester type, a polyamide type, an
olefin type, and a styrene type, or a mixture thereof.
[0067] In an initial state of the female syringe 14 illustrated in
FIG. 1, the cap 58 is attached to the cylindrical portion 38. The
cap 58 is detached from the cylindrical portion 38 when the female
syringe 14 is used (when the syringe kit 10 is used).
[0068] In FIG. 4, the cap 58 closes the distal end opening 56a of
the packing 56 in a liquid tight manner. As a result, the cap 58
closes the distal end opening 38a of the cylindrical portion 38 in
a liquid tight manner via the packing 56. The cap 58 covers the
cylindrical portion 38 and detachably engages with the projection
42. Specifically, the cap 58 includes the base 58a, the convex
fitting portion 58b projecting in the proximal end direction from
the base 58a, and a cylindrical cover portion 58c that surrounds
the convex fitting portion 58b and projects in the proximal end
direction from the base 58a.
[0069] The base 58a forms a distal end portion of the cap 58. The
convex fitting portion 58b is formed into a cylindrical shape that
projects in the proximal end direction from a central portion of
the base 58a. The outer peripheral portion of the convex fitting
portion 58b is formed into a tapered shape an outer diameter of
which decreases in the proximal end direction. Note that the outer
peripheral portion of the convex fitting portion 58b may also be
formed into a straight shape having a constant outer diameter in
the axial direction. In a state in FIG. 4 in which the cap 58 is
attached to the cylindrical portion 38, the convex fitting portion
58b fits to the first fitting surface 60a of the packing 56 but
does not fit to the second fitting surface 62a, and the outer
peripheral surface of the convex fitting portion 58b is in close
contact with the first fitting surface 60a over the entire
circumference.
[0070] The cylindrical cover portion 58c projects in the proximal
end direction from the convex fitting portion 58b. The cylindrical
cover portion 58c is formed into a substantially cylindrical shape.
A screw 58d is formed on an inner peripheral surface of the
cylindrical cover portion 58c. In FIG. 4, the screw 58d engages
with the projection 42 provided on the cylindrical portion 38. A
most proximal end portion 58de of the screw 58d is located on the
proximal end side (opening 58f side of the cap 58) than a proximal
end surface 58be of the convex fitting portion 58b (refer to FIG.
7).
[0071] The cap 58 is formed of a material harder than that of the
packing 56 (for example, selected from those exemplified below as
components of the male syringe barrel 16 and the female syringe
barrel 30).
[0072] In FIG. 1, the gasket 32 is inserted into the barrel body 36
via the proximal end opening 36a that opens at the proximal end of
the barrel body 36. The gasket 32 seals the proximal end of the
barrel body 36 in a liquid tight manner. The gasket 32 is formed
of, for example, an elastic material such as a rubber material. The
gasket 32 is slidably arranged in the barrel body 36 with an outer
peripheral portion in liquid tight contact with the inner
peripheral surface of the barrel body 36.
[0073] The gasket 32 is connected to a distal end portion of the
pusher 34. When the user pushes the pusher 34 in the axial
direction (distal end direction or proximal end direction), the
gasket 32 slides in the axial direction in the barrel body 36. Note
that, the pusher 34 may be connected to the gasket 32 when the
female syringe 14 is used.
[0074] The medical fluid ML is fluid capable of dissolving,
diluting, or mixing the medicine M in the male syringe 12. Such
medical fluid ML may be medicine solvent such as physiological
saline, medicine diluent, medicine mixture, or medicine solution
containing medicine (for example, vitamins and minerals). Note
that, it is sufficient that the medical fluid ML is not filled in
advance in the female syringe 14 as in this embodiment but sucked
by a required amount from a vial or the like into the empty female
syringe 14 as necessary.
[0075] In this embodiment, the male syringe barrel 16 and the
female syringe barrel 30 are both made of cyclic polyolefin having
high rigidity and high toughness. Note that the male syringe barrel
16 and female syringe barrel 30 may be made of polypropylene,
polyethylene, polystyrene, polyamide, polycarbonate, polyvinyl
chloride, poly-(4-methylpentene-1), acrylic resin,
acrylonitrile-butadiene-styrene copolymer, polyester such as
polyethylene terephthalate and the like.
[0076] Next, a method of using the syringe kit 10 configured as
described above is described.
[0077] First, in the male syringe 12 and female syringe 14
illustrated in FIG. 1, the cap 50 is detached from the nozzle 24 of
the male syringe barrel 16 and the cap 58 is detached from the
cylindrical portion 38 of the female syringe barrel 30 (opened).
When the cap 58 is detached from the cylindrical portion 38, as
illustrated in FIG. 7, the packing 56 remains in the cylindrical
portion 38, and the distal end opening 56a of the packing 56 is
opened. That is, since the packing 56 is fixed to the cylindrical
portion 38 by the engagement between the engaging convex portion
39a and the engaging concave portion 39b, the packing 56 is
separated from the cap 58 (convex fitting portion 58b) along with
the removal of the cap 58 from the cylindrical portion 38.
[0078] Next, as illustrated in FIG. 8, the male syringe barrel 16
and the female syringe barrel 30 are connected to each other.
Specifically, the screw 28 of the lock adapter 26 and the
projection 42 provided on the cylindrical portion 38 of the female
syringe barrel 30 are screwed together. Along with this screwing,
the nozzle 24 of the male syringe barrel 16 is inserted into the
cylindrical portion 38 of the female syringe barrel 30 and the
packing 56. As a result, the packing 56 is held between the
cylindrical portion 38 and the nozzle 24 in a compressed state, the
inner peripheral surface of the packing 56 is brought into close
contact with the tapered outer peripheral surface 24a of the nozzle
24 in a liquid tight manner over the entire circumference, and the
outer peripheral surface of the packing 56 is brought into close
contact with the inner peripheral surface of the cylindrical
portion 38 in a liquid tight manner over the entire
circumference.
[0079] Next, the medical fluid ML and the medicine M are mixed by
performing a pumping operation using the pusher 20 of the male
syringe 12 and the pusher 34 of the female syringe 14.
Specifically, the medical fluid ML is injected from the female
syringe barrel 30 into the male syringe barrel 16 by pushing the
pusher 34 of the female syringe 14 toward the female syringe 14,
and the medical fluid ML is mixed with the medicine M in the male
syringe barrel 16. Next, the pusher 20 of the male syringe 12 is
pushed toward the male syringe 12 to inject the mixture (the
mixture of the medical fluid ML and the medicine M) from the male
syringe barrel 16 into the female syringe barrel 30. Then, by
repeating such movement of the mixture several times between the
male syringe barrel 16 and the female syringe barrel 30,
dissolution, dilution or mixing of the medicine M is promoted, and
desired medicine solution is prepared.
[0080] In this case, according to this embodiment, the female
syringe 14 is provided with the hollow cylindrical packing 56
arranged in the cylindrical portion 38 and is integrated with the
cylindrical portion 38, and the cap 58 that covers the cylindrical
portion 38 and closes the distal end opening 56a of the packing 56
in a liquid tight manner. Then, when the cap 58 is detached from
the cylindrical portion 38, the packing 56 integrated with the
cylindrical portion 38 remains in the cylindrical portion 38, the
distal end opening 56a is opened, and the nozzle 24 may be fit in a
liquid-tight manner to the inner side of the packing 56. For this
reason, even when the cap 58 is detached from the cylindrical
portion 38 of the female syringe barrel 30, the packing 56 remains
in the cylindrical portion 38. Then, when the projection 42 and the
lock adapter 26 are screwed together to connect the female syringe
barrel 30 and the male syringe barrel 16, the nozzle 24 is inserted
into the cylindrical portion 38. As a result, the cylindrical
portion 38 and the nozzle 24 are fitted in a liquid-tight manner
via the packing 56. Therefore, damage and deformation of the female
syringe barrel 30 may be inhibited while securing good liquid
tightness at the time of fitting.
[0081] The cap 58 includes the base 58a and the convex fitting
portion 58b projecting in the proximal end direction from the base
58a, and before opening the cap 58, the packing 56 is held between
the inner peripheral surface of the cylindrical portion 38 and the
outer peripheral surface of the convex fitting portion 58b over an
entire circumference in a compressed state. This configuration may
ensure better liquid tightness.
[0082] The inner peripheral surface of the packing 56 includes the
first fitting surface 60a to which the convex fitting portion 58b
is fitted and the second fitting surface 62a having the inner
diameter smaller than the inner diameter of the first fitting
surface 60a formed on the proximal end side than the first fitting
surface 60a to which the nozzle 24 of the male syringe 12 may be
fitted. With this configuration, the inner diameter is set
individually for the first fitting surface 60a and the second
fitting surface 62a, so that the liquid tightness may be better
secured in the cap attached (unopened) state and the male/female
syringe fitted state.
[0083] In this case, the second peripheral wall portion 62 having
the second fitting surface 62a is held between the cylindrical
portion 38 and the nozzle 24 in a compressed state. Therefore, a
liquid tight seal is formed over the entire circumference between a
distal end portion outer peripheral surface 24d of the nozzle 24
and the packing 56, and a liquid tight seal is formed over the
entire circumference between a proximal end portion outer
peripheral surface 56b of the packing 56 and the female syringe
barrel 30. Therefore, the liquid tightness in the fitting state
between the cylindrical portion 38 and the nozzle 24 may be better
secured.
[0084] In one of the inner peripheral surface of the cylindrical
portion 38 and the outer peripheral surface of the packing 56, a
radially projecting engaging convex portion 39a is provided, and on
the other of the inner peripheral surface of the cylindrical
portion 38 and the outer peripheral surface of the packing 56, the
engaging concave portion 39b having a depth in the radial direction
is provided. Then, movement of the packing 56 in the axial
direction with respect to the cylindrical portion 38 is restricted
by the engagement of the engaging convex portion 39a with the
engaging concave portion 39b. As a result, removal of the packing
56 from the cylindrical portion 38 when the cap 58 is opened may be
realized by a simple configuration, and the packing 56 may be
surely left inside the cylindrical portion 38 after the cap 58 is
opened.
[0085] In a case of this embodiment, the engaging concave portion
39b is provided on the outer peripheral surface of the packing 56.
By this configuration, the movement in the axial direction of the
packing 56 may be restricted without deteriorating rigidity of the
cylindrical portion 38.
[0086] On the distal end portion of the packing 56, the ring-shaped
swelling portion 64 that projects radially outward and is locked by
the distal end surface 38e of the cylindrical portion 38 is
provided. Therefore, when the nozzle 24 is fitted to the packing
56, the movement of the packing 56 toward the barrel body 36 may be
surely inhibited.
[0087] The cylindrical portion 38 includes a first cylindrical
portion 38A provided with the projections 42 and having an outer
diameter smaller than an inner diameter of the screw 28, and a
second cylindrical portion 38B formed so as to be adjacent to a
proximal end side of the first cylindrical portion 38A and having
an outer diameter larger than the outer diameter of the first
cylindrical portion 38A. Then, as illustrated in FIG. 8, in a state
in which the fitting of the nozzle 24 to the cylindrical portion 38
via the packing 56 is completed, the screw 28 on the distal end
portion of the lock adapter 26 is fitted to the second cylindrical
portion 38B. With this configuration, when the screw 28 on the
distal end portion of the lock adapter 26 is fitted at the time of
fitting, a fitting force stronger than that only the fitting via
the packing 56 may be obtained.
[0088] As illustrated in FIG. 9, the abutment portion 38b provided
on the cylindrical portion 38 restricts the fitting depth of the
nozzle 24 into the cylindrical portion 38 because the distal end
26a of the lock adapter 26 abuts when the nozzle 24 is fitted to
the cylindrical portion 38 via the packing 56. Therefore, excessive
fitting between the cylindrical portion 38 and the nozzle 24 may be
effectively inhibited.
[0089] In the above-described syringe kit 10, the outer diameter D1
of the barrel body 22 of the male syringe barrel 16 and the outer
diameter D2 of the barrel body 36 of the female syringe barrel 30
may be both 6.7 mm or larger, and the length in the axial direction
of the barrel body 22 of the male syringe barrel 16 and the length
in the axial direction of the barrel body 36 of the female syringe
barrel 30 may be both 35 mm or longer.
[0090] In general, a barrel for a syringe including a barrel body
with such an outer dimension is likely to be subjected to strong
torque at the time of screwing and is easily broken or deformed;
however, the present invention in which breakage or deformation of
the cylindrical portion 38 may be inhibited and deterioration in
the liquid tightness between the nozzle 24 and the cylindrical
portion 38 may be effectively inhibited is useful.
[0091] The present invention is not limited to the above-described
embodiment, and various modifications may be made without departing
from the scope of the present invention.
[0092] The contents of the male syringe 12 and the contents of the
female syringe 14 may be opposite to those in the embodiment
described above. That is, the male syringe 12 may be filled with
the medical fluid ML and the female syringe 14 may be filled with
the medicine M.
* * * * *